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Several significant sections of Paleozoic and Mesozoic rocks occur in close proximity to one another at the foot of the Front Range west of Denver. The Paleozoic section on the east flank of the central Front Range is well exposed in Red Rocks Park. Excellent exposures of the Mesozoic section are at the 1-70 Road Cut, and along Rooney Road, east of the Dakota Hogbak on the southeast side of 1-70.

Location and access. Red Rocks Park is located northwest of Morrison, Colorado, 10 mi (16 km) west of Denver (Fig. 1). The 1-70 Road Cut is located west of Denver, 3 mi (5 km) south of Golden, Colorado, and is the point at which 1-70 cuts the Dakota Hogback. Rooney Road is east of the Dakota Hogback on the southeast side of 1-70. To reach all three sites, proceed west from Denver about 10 mi(16 km) on 1-70. Leave 1-70 at the Morrison Exit, which is well marked. A parking lot and footpath adjacent to the exit provide access to the 1-70 Road Cut site. To reach the Red Reeks and Rooney Road sites, proceed south from the exit on Colorado 26. About 1 mi (1.6 km) south of 1-70, signs at a marked intersection will direct one west to Red Rocks Park, or east to Rooney Road via Colorado 26 (Alameda Parkway). All three localities are on publicly owned lands and can be reached by passenger car. Adequate parking is available at each locality. Generalized lithologies and

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